Sewing-machine table-frame and treadle



(No Model.) I 2 Sheets-Sheet 1:

J. 'E. DONOVAN.

Sewing Machine Table Franie and Tread le. No. 248,529. Patented June 28, 1881.

2 Shuts-Sheet 2.

(No Model.)

' JLE. DONOVAN. Sewing Machine Table Frame and Treadle.

Patehted June 28,1881.

u. Firms Pam-mummy, Wishing! 0.1:. 4

UNITED STATES PATENT OFFICE.

JOHN E. DONOVAN, OF GINOINNATI, OHIO.

SEWING-MACHINE TABL E-FRAME AND TREADLE.

SPECIFICATION forming part of Letters Patent No. 243,529, dated June 28, 1881.

Application filed May 24, 1881. No model.) I

To all whom it may concern:

Be it known. that I, JOHN E. DONOVAN, a citizen of the United States, and a residentof Cincinnati, in the county ofHamilton and State of Ohio, have invented certain new and useful Improvements in Sewing-Machine Table- Frames and Treadles, of which the following is a specification.

My invention relates to improvements in sewing-machine frames; and it consists, first, in constructing the frame for the table and arranging the parts of the sides of the frame so that a V-shaped bearin g adapted to support a knife-edge treadle-bar is provided centrally at the bottom of each side of the frame; and, secondly, in attaching the lower ends of the central brace-bar at each side of the frame and vertically over the treadle-bar in its bearings.

A third feature of my invention consists of an inclined shoulder placed on each end of the treadle-bar vertically over the journal-points and secured in position by means of an inclined lug resting upon the inclined shoulder of said treadle-supports, so as to secure the treadlebar in position, and thereby prevent vertical and end play.

Another feature of my invention consists in providing a bracket upon the central archbrace of the table-frame, which is provided with an enlarged hole, to which is attached a shieldyoke, to which are attached the crank-journals of the driving mechanism.

The Object of my invention is to secure a more substantial table-frame to the driving mechanism and provide adequate means for' the employment of V-shaped treadle-bearin gs, so as to obviate the difficulty heretofore occasioned by lost motion, consisting in vertical and endwise play of the treadle bar or shaft.

Other features of my invention will be fully set forth in the description of the accompanyin g drawings.

In the accompanying drawings, Figure 1 is a perspective view of a sewing-machine frame embodying my invention. Fig. 2 is a broken sectional plan on line m m, Fig. 1. Fig. 3 is a longitudinal section on line y y, Fig. 1. Fig. 4 is a detail perspective view of the treadlebar and attaching-button. Fig. 5 is a broken detail elevation of the bracket on thecentral arch brace-bar for attaching yoke for driving and bearing with fastening plate removed. Fig. 7 is a detail perspective view, showing the inner face of the fastening-platefor the treadlebar. Fig. 8 is a perspective view, showing a modified form of mounting treadle upon knifeedge bearings with inclined adjusting devices. Fig. 9 is alongitudinal central section of the same on the line 2 2, Fig. 8. Fig. 10 is a transverse section on line 2 2, Fig. 9.

A A represent the two end pieces which form the legs or sides of the table-frame.

B represents a double arch brace-bar, which is secured by four bolts to the sides A A.

b I) represent bosses provided on the sides A A, to secure requisite strength for attachin g the arch brace-bar B to the sides A A.

B represents a central vertical bar cast with and forming a part of the sides A A. It is provided with bosses b b, through which pass of supporting these bearings may be provided.

D represents a bracket or arm projecting from the central brace, B, as shown in the drawings.

E represents a yoke and shield, to which the crank-journals of the driving-wheel'are attached. The method of mounting the driving-wheel and attaching the crank-journals is clearly shown in Letters Patent numbered 225,809, granted meMarch 23,1880. In order. to overcome the springing of this yoke, the log or bracket D is cast upon the brace B and projected off so as to come opposite the end of the yoke E, and a screw-bolt attaches the yoke E firmly to the lug D. 0 represents an enlarged screw-hole pierced through the face of lug or bracket D, through which passes the screw d. This enlargement of the hole 6 allows the attachment of the parts without fitting or springing thereof, and provides much stronger support than could otherwise be attained. Instead of casting this lug on the brace B, it might be cast onto the end of the yoke E, and then secured to the brace B by a screw in a similar manner. This feature of my improved sewing-machine frame is a very important one, as it firmly holds the parts rigidly in position and prevents their yielding to strains on the machine, which would otherwise occur when the machineis driven rapidly by the feet of the operator. This form of attaching the supporting parts of the frame and the bracing of the parts secures a very firm, substantial frame.

F represents a treadle-bar, which can be made of cast-iron and cast on and with treadle F.

Gr represents a rounded knife-edge bearing on the treadle-shaft F.

9 represents a shoulder. This shoulder may be omitted when my improved button-fasteners areused.

H represents an inclined shoulder upon the upper side of shaft F.

I represents a fastening-plate, which is attached to the base of the frame A A over the treadle-bearings by a screw passing through the slot '6.

I represents an inclined lug or shoulder which projects inward and rests upon the inclined shoulder H.

When both buttons I I are adjusted so as one point of each touches the shoulders H H on the shaft F all lost motion of the treadleshaft, both longitudinal and vertical, is taken up. As the shaft F and shoulders H rock backward and forward by the operation of the treadle F, it is desirable to have the shoulders H rounded on their top faces, and the under side of the lug I may be made slightly convex, so that one point only will bear against the shoulder H, prevcntin g friction and undue Wearing of the parts. The slot 1' allows the accurate adjustmentof the plate t" represents a teat on the inner face of the plate I, which rests in a corresponding elongated groove made in the face of the frame opposite the teat 6.

Figs. 8, 9, and 10 show a modified form of employing knife-edge bearings and inclined fastening and adjusting devices, in which K represents a treadle-shaft.

L represents oblong grooves cut in the upper face of the shaft or bar.

M M represent lugs cast on each side of the treadle J. The under sides of the lugs form roundedkniie-edgebearin gs, which are loosely seated in the grooves L.

m m represent inclined shoulders similar in shape, purpose, and function to shoulders H, above described.

N N represent adjustable collars placed on the shaft K.

O 0 represent inclined lugs cast on said col lars, projecting laterally over and resting against the shoulders on. These lugs O are similar in shape and function to the lugs 1 above described, and the adjustment of these lugs 0 against the shoulders m prevents lateral play of the treadle. The use of the inclined shoulders and fastening-lugs upon knife-edge treadle-bearings is a very important improvement.

Frequent attempts have been made to use knife-edge bearings for the treadle in sewing machines; but it has been found to be difficult to prevent lateral lost motion and to adjust the parts so as to compensate for their wear and to prevent rattling of the treadle, which has been a serious objection in their employment. My herein-described improvements have overcome all the serious objections hitherto attending their use.

I claiml. A treadle-bearing for a sewing-machine frame, provided with knife-edge bearin gs hav ing an inclined shoulder vertically over the journal-points, and secured in V-shaped rocker bearings by means of an adjustable inclined lug resting upon theinclined shoulder of said treadle-supports, substantially as herein set forth.

2. A frame for a sewing-machine table, consisting of the side frames, A A, the arched brace-bar B, the central vertical bars, B, the knife-edge bearings 0, arranged vertically under said bars, and the rocking treadle-bar F, having at its ends the knife-edge bearings G, substantially as described.

3. In a sewing-machine table, the combination of the sides A A, constructed with the bosses b, and the central vertical bars, B, havin g the bossesb at their lower ends, attached respectively to the bosses on the sides and 011 the vertical bars, substantially .as described.

4. In a sewing-machine table-frame employing a U-shaped yoke for supporting the driving-wheel and crank-journals, a supportinglug, D, for uniting the yoke-bearing with the arch-brace B, substantially as herein set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN E. DONOVAN.

Witnesses:

Jno. E. JONES, CHARLES H. AVERY. 

